Express more. Quickly. Inspired by nature. Clinically proven as effective as competitor electric pumps and the manual pump preferred by breastfeeding moms. The ISIS Manual Breast Pump is designed to be physiological – stimulating a natural milk flow most like natural breastfeeding. ISIS is the only manual pump with a gentle Let-down Massage Cushion that flexes as you pump and creates a reliable vacuum, so you can express milk gently and quickly. ISIS is clinically proven as effective as competitor electric pumps, resulting in the same amount of milk in the same amount of time, and also rated by mothers as more comfortable to use. It’ s easy to see why ISIS is the manual pump preferred by most moms. ISIS works with the entire Philips AVENT Natural Feeding System and lets you pump, store and feed in any bottle or cup. Try it and see.